CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($)	Common Stock [Member]	Additional Paid in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Beginning Balance at Dec. 31, 2018		$ 46,857,734	$ 2,650,296	$ (2,268,264)	$ (1,777,205)	$ 45,462,561
Beginning Balance (in shares) at Dec. 31, 2018	5,510,917
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			1,689,264			1,689,264
Other comprehensive income					991,936	991,936
Stock option exercises		51,265				51,265
Stock option exercises (in shares)	5,808
Stock-based compensation expense		18,881				18,881
Cash dividends			(882,676)			(882,676)
Ending Balance at Mar. 31, 2019		46,927,880	3,456,884	(2,268,264)	(785,269)	47,331,231
Ending Balance (in shares) at Mar. 31, 2019	5,516,725
Beginning Balance at Dec. 31, 2018		46,857,734	2,650,296	(2,268,264)	(1,777,205)	45,462,561
Beginning Balance (in shares) at Dec. 31, 2018	5,510,917
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income						3,530,111
Other comprehensive income						2,030,501
Ending Balance at Jun. 30, 2019		47,041,739	4,413,687	(2,314,107)	253,296	49,394,615
Ending Balance (in shares) at Jun. 30, 2019	5,525,278
Beginning Balance at Mar. 31, 2019		46,927,880	3,456,884	(2,268,264)	(785,269)	47,331,231
Beginning Balance (in shares) at Mar. 31, 2019	5,516,725
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			1,840,847			1,840,847
Other comprehensive income					1,038,565	1,038,565
Stock option exercises		94,977		(45,843)		49,134
Stock option exercises (in shares)	8,553
Stock-based compensation expense		18,882				18,882
Cash dividends			(884,044)			(884,044)
Ending Balance at Jun. 30, 2019		47,041,739	4,413,687	(2,314,107)	253,296	49,394,615
Ending Balance (in shares) at Jun. 30, 2019	5,525,278
Beginning Balance at Dec. 31, 2019		47,131,034	5,879,409	(2,325,225)	482,814	$ 51,168,032
Beginning Balance (in shares) at Dec. 31, 2019	5,530,001					5,530,001
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			1,521,131			$ 1,521,131
Other comprehensive income					601,016	601,016
Stock option exercises		4,489				4,489
Stock option exercises (in shares)	362
Stock-based compensation expense		16,418				16,418
Cash dividends			(884,859)			(884,859)
Ending Balance at Mar. 31, 2020		47,151,941	6,515,681	(2,325,225)	1,083,830	52,426,227
Ending Balance (in shares) at Mar. 31, 2020	5,530,363
Beginning Balance at Dec. 31, 2019		47,131,034	5,879,409	(2,325,225)	482,814	$ 51,168,032
Beginning Balance (in shares) at Dec. 31, 2019	5,530,001					5,530,001
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income						$ 3,022,154
Other comprehensive income						1,571,714
Ending Balance at Jun. 30, 2020		47,290,003	7,131,796	(2,515,472)	2,054,528	$ 53,960,855
Ending Balance (in shares) at Jun. 30, 2020	5,530,682					5,530,682
Beginning Balance at Mar. 31, 2020		47,151,941	6,515,681	(2,325,225)	1,083,830	$ 52,426,227
Beginning Balance (in shares) at Mar. 31, 2020	5,530,363
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			1,501,023			1,501,023
Other comprehensive income					970,698	970,698
Stock option exercises		108,757		(41,697)		67,060
Stock option exercises (in shares)	9,619
Stock-based compensation expense		29,305				29,305
Cash dividends	$ (9,300)			(148,550)		(148,550)
Ending Balance at Jun. 30, 2020		$ 47,290,003	$ 7,131,796	$ (2,515,472)	$ 2,054,528	$ 53,960,855
Ending Balance (in shares) at Jun. 30, 2020	5,530,682					5,530,682